Interchangeable Firearm Bottom Metal for Universal Stock Fit
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Solution Overview
Problem
Existing firearms lack interchangeability between stocks and bottom metal assemblies configured for detachable box magazines and hinged floor plates, leading to unique opening sizes and dimensions that restrict compatibility across different styles and sizes of cartridges.
Innovation Solution
Development of interchangeable bottom metal assemblies that can fit stocks designed for either detachable box magazines or hinged floor plates, allowing for a single stock to accommodate various cartridge lengths and types without requiring separate stock modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If stocks are manufactured with different opening sizes for detachable box magazine bottom metals versus hinged floor plate bottom metals, then each bottom metal type fits its designated stock opening, but interchangeability between different bottom metal styles and cartridge configurations is lost
Solution Approach 1:
The bottom metal assembly is designed with a universal interface that accommodates multiple functions: it can be configured for detachable box magazines or hinged floor plates, and can accommodate various cartridge lengths (short action, long action, magnum). The enlarged opening in the stock serves as a universal receptacle for all these configurations, eliminating the need for separate stock designs for each bottom metal type.
Solution Approach 2:
The invention changes the parameter of the stock opening size from multiple specialized sizes to a single enlarged universal size. This parameter change allows the same stock opening to receive different bottom metal assemblies (DBM or hinged floor plate) and different cartridge configurations, thereby achieving interchangeability while simplifying stock manufacturing.
2Manufacturing precision
If multiple stock designs with different opening sizes are created for various cartridge lengths and bottom metal types, then each configuration fits precisely, but the number of unique stock designs and manufacturing complexity increases
Solution Approach 1:
A single stock design with an enlarged opening serves multiple purposes: it accommodates short action cartridges, long action cartridges, magnum cartridges, detachable box magazine bottom metals, and hinged floor plate bottom metals. This universal design eliminates the need for multiple specialized stock designs while maintaining proper fit and function for each configuration.
Solution Approach 2:
The bottom metal assembly is designed as a separate, interchangeable component that can be configured for different cartridge types and bottom metal styles. This segmentation allows the stock to remain simple and universal while the bottom metal assembly handles the specific adaptations needed for different configurations.
3Reliability
If unique opening sizes are used for each bottom metal configuration, then each assembly fits its designated opening, but versatility in firearm configurations and interchangeability are restricted
Solution Approach 1:
The enlarged stock opening is designed as a universal interface that reliably receives various bottom metal assemblies. The bottom metal assemblies themselves are designed with standardized mounting features that ensure reliable attachment to the stock while allowing versatility in configuration for different cartridge types and bottom metal styles (DBM or hinged floor plate).
Data Source
AI summary
Firearm assemblies having a receiver, a stock, and a bottom metal with integral sidewalls defining a cartridge receiving area are disclosed. The sidewalls of the bottom metal preferably extend vertically into a recess defined by the receiver. Spacers arranged to reduce a dimension of the cartridge receiving area of the bottom metal assembly, but not the number of receivable cartridges, are also disclosed.